One hot August day, Sly Sam told Hard Working Hal if Hal would paint his garage he would pay him $500.Hal promptly purchased the paint and proceeded to paint the garage.When Hal had painted all of the garage except a very small portion on the very back (no one could see), Sam ran out and said, "I revoke this oral, uniliateral contract --- after all, I had Business Law I and know I can do this legally.Is there a remedy available to Hard Working Hal?Explain.